\documentclass{beamer}
For presentation slides.
The output is landscape-oriented. The document is separated in "frames" (slides).
Following example was adapted from : sharelatex.com/learn/Beamer
\documentclass{beamer}
\usepackage[utf8]{inputenc}
\title{Sample title}
\author{Me}
\date{\today}
\begin{document}
\frame{\titlepage}
\begin{frame}
\frametitle{Sample frame title}
This is a text in first frame. This is a text in first frame. This is a text in first frame.
\end{frame}
\end{document}